Tom G. Christensen wrote:
Nick Lunt wrote:
Redhat does not support more than 16GB of RAM on 32bit RHEL 5.
See here: https://www.redhat.com/rhel/compare/
Thanks for the link, so what is the point in the PAE kernel ?
IIRC using PAE incurs a slight overhead
That might have been true back when PAE was introduced in the Pentium
Pro, and was an exotic toy noone used. The overhead is that in PAE mode
you have 3-level page tables versus 2-level in classical x86 virtual
mode. If there would be any measurable difference, surely it would be
even worse on x86-64 which extends the 3-level PAE page table layout
with a fourth level?
which could be why the default
kernel only supports upto 4GB of RAM.
There are some still widely used processors that don't support PAE, such
as Pentium M.
--
Janne Blomqvist
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